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I currently own a 13" macbook unibody (the one from 2008) I have reinstalled my laptop half a dozen times with no problems in the past but after a recent fresh install its playing up. It works ok for around 30mins then the beach ball comes up and the laptop completely freezes for a few minutes then starts to work again. This lag happens all days long, Ive tried only running certain programs to see if I can isolate the problem but it appears to freeze and unfreeze whatever. Ive repaired disk permissions and all that stuff. When I do a fresh reinstall I always completely wipe the OSX and zero the data. I expect the best thing to do is to reinstall the operating system again and see if it persists but I have installed loads of software, music, files etc and I cant be bothered to do it unless I really need to. Any ideas ?????????